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As shown in the diagram, one end of a 11-foot-long electric cable is fixed at point A on the wall, and the other end of the cable (denoted by C) is a sensor. There is a pin attached to the cable at a point B that is 4 units away from C, and the pin can be fixed to any point on the wall reachable by B. Due to gravity, the free part of the cable (i.e. BC) is always perpendicular to the ground  A few other measurements are provided in the diagram. What is the minimum distance between C and D

 

 Feb 12, 2021
 #1
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By using calculus, the minimum distance is 7.

 Feb 12, 2021
 #2
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It says 7 is incorrect

Guest Feb 12, 2021
 #3
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Don't listen to guests who don't give an explanation

 Feb 12, 2021

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